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Small outline dual inline memory module (SO-DIMM) is a type of computer memory that is smaller than the regular DIMM used in desktop PCs. SO-DIMM uses the same circuitry and microchips as other memory modules, but is made in a smaller form factor to fit devices that do not have much space such as laptops, high-end printers, enterprise-grade networking hardware and even small-form-factor PCs like those that use mini-ITX motherboards.
SO-DIMMs are noticeably smaller than regular DIMMs, about only half the length of the latter. However, they are more or less equal in power and voltage ratings to DIMMs, so their small size does not necessarily mean that they have lower memory capacities or lower performance. Their smaller size means that device manufacturers can easily design them into their devices without problem. Laptops usually have user-accessible SO-DIMM slots on the bottom, but slots are sometimes located in different places depending on the brand and model.
The first SO-DIMMs used 72-pin connectors, which meant they could only be used for 32-bit addressing. Although modern SO-DIMMs are nearly on par with their DIMM counterparts, they still lag behind them in performance and capacity, pending miniaturization of the newer technology being applied on DIMMs.
SO-DIMM pin configurations: